Chapter 5, Problem 18A

Summary Introduction

Introduction:

Extinction is defined as a complete disappearance of an animal or a plant in entire world. The extinction of an organism is confirmed by the death of last known individual of that species. It is generally a natural evolutionary process, but sometimes it may happen at an unusual faster rate due to extreme climate change.

Answer to Problem 18A

The correct answer is option B.

Explanation of Solution

Explanation/justification for the correct answer:

Option (B) flowering plant. Total 3844 flowering plants are extinct, which is highest. Hence, it is the correct answer.

Explanation for incorrect answer:

Option (A) birds. Total, 113 birds have extinct, which is less than that of flowering plants. Hence, it is incorrect.

Option (C) invertebrates. Total 98 species of invertebrates are extinct, which is less than that of flowering plants. Hence, it is incorrect.

Option (D) mammals. Total 85 species of mammals are extinct, which is less than that of flowering plants. Hence, it is incorrect.